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Heavy quark $R_{AA}$ and $v_2$ have been calculated at RHIC energyconsidering initial conditions with and without pre-equilibrium phase tohighlight the effect of the latter on heavy quark observables. The momentumevolution of the heavy quark has been studied by means of the Boltzmanntransport equation. To model the pre-equilibrium phase we have used the KLNinitial condition. We have found that the pre-equilibrium phase impacts the$R_{AA}$ of about 20-25 $\%$ whereas the impact on $v_2$ is very negligible. Wehave also calculated heavy quark $R_{AA}$ and $v_2$ in the case ofinitializations with early thermalized quark-gluon plasma. We have checked thatthe particular form of the initial spectrum is not very important for $R_{AA}$,the larger energy density being more important. In fact, comparing the resultsobtained within the two initializations we have found that one can mimic theimpact of the pre-equilibrium phase using a early thermalized QGP medium.

Effect of pre-equilibrium phase on $R_{AA}$ and $v_2$ of heavy quarks in heavy ion collisions